Canada has banned imports of cattle from Texas following an outbreak of screwworm, a flesh-eating parasite that has spread through Central America and Mexico. The decision marks the first time Canadian officials have restricted US livestock since the infestation reached American soil.
The cases marked the first as part of an outbreak that has been moving through Central America and Mexico, which has been under heavy monitoring by US agricultural and health officials. Governor Greg Abbott issued a disaster proclamation Friday declaring the outbreak presents "an imminent threat or occurrence of widespread danger and injury to the Texas agricultural industry." The declaration directs additional resources to affected areas in hopes of combating spread.
What the Right Is Saying
Texas officials and conservative agricultural leaders have defended the state's response while criticizing Canada's action as premature. Governor Abbott's disaster declaration represents a strong state-level commitment, said Texas Farm Bureau President Russell Boening. He emphasized that Texas ranchers are on the front lines of fighting this pest and deserve support rather than trade restrictions from allies.
Republican lawmakers from cattle-producing states argue the focus should remain on containment through proven methods. Representative Mike Ezell highlighted that screwworm was eradicated in the United States once before, in 1966, and can be eliminated again with aggressive action. The USDA's plan to release genetically altered sterile flies represents decades of scientific advancement working in farmers' favor, he noted.
Some conservative commentators have framed Canada's ban as an overreaction given the parasites' preference for warm climates. "Ottawa itself acknowledges this bug can't survive Canadian winters," wrote one columnist. "This looks more like trade protectionism than science-based policy." Agricultural industry groups echo these concerns, warning that preemptive bans could set a pattern affecting other US exports.
What the Left Is Saying
Progressive lawmakers and agricultural policy advocates are calling for increased federal coordination to prevent further spread. Senator John Boozman, chairman of the Senate Agriculture Committee, said the USDA must lead a unified response that includes robust border screening and compensation programs for affected ranchers. The National Farmers Union has urged the administration to prioritize small family farms in any relief efforts, warning that large-scale infestations could devastate independent ranchers who lack the resources to absorb losses.
Environmental health advocates argue the outbreak highlights broader concerns about agricultural inspection protocols. Representative Alma Salinas noted that decades of budget constraints on USDA border inspections created vulnerabilities. "When you underfund the people protecting our food supply, this is what happens," she said. Some progressive groups are also using the moment to push for investments in regenerative ranching practices they say could reduce susceptibility to parasites.
What the Numbers Show
Canada's agriculture department reported 550,000 cattle imported from the United States in 2025, representing a significant portion of cross-border livestock trade. The US-Canada bilateral cattle relationship includes animals moving across the border for slaughter, breeding, dairy production, and wool purposes. Canadian officials note imports have grown in recent years, though exact figures for prior periods were not immediately available.
The screwworm was declared eradicated in the United States in 1966 following a decades-long eradication campaign. However, cases have appeared since that time, including an outbreak in the 1970s and sporadic incidents thereafter. The current infestation represents the first appearance of screwworm along the US-Mexico border in this particular wave of Central American spread.
US agricultural officials plan to release hundreds of millions of genetically altered sterile male flies as part of their containment strategy. Combined with sniffer dog detection programs, officials estimate the approach could reduce screwworm populations significantly within one to two breeding seasons if implemented comprehensively across affected regions.
The Bottom Line
Canada's ban on Texas cattle imports creates immediate economic pressure on US ranchers already dealing with containment costs. While Canadian officials acknowledge that colder climates make establishment of screwworm unlikely in their country, they are requiring farmers to monitor livestock for wounds accompanied by discharge or foul odor and urging travelers returning from Texas to check pets.
The coming weeks will test whether the USDA's sterile fly release program can outpace the infestation's spread. Both nations have committed to information sharing under existing agricultural health agreements. Ranchers in affected Texas counties should document losses carefully, as disaster declaration language suggests possible eligibility for federal assistance programs. Industry observers will watch whether other trading partners follow Canada's lead in restricting US livestock imports.
The situation remains fluid. Officials on both sides of the border are expected to provide updated assessments within the next two weeks as spring weather patterns could affect screwworm breeding cycles.